OSX Firewall - Accept Incoming Network Connections Issue

I have the firewall enabled on my OSX installation, and everytime I fire up my email application for work I get the following message: ""Do you want the application 'xxx.app' to accept incoming network connections?" Found a screenshot for iTunes (not my email application) here:

Of course I clicked Accept, but every-time I launch it, I get the message. Doing some googling I found some simliar errors around the code signing of the application:

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